Maybe it's because I don't run barrels competitively, but what do you mean you want it for turns? Do you need strong contact to execute a tight turn? You should be able to deepen your seat, get your horse on his haunches to lighten the front end and neck rein the turn, in theory. Do you have a really solid turn on the haunches (with neck reining)?
Personally (and don't take this the wrong way!) I would never use a jointed shanked bit, period (in my mind they seem a little confusing!), let alone a jointed shanked bit with a twist. I'm very simplistic with bits, though... 95% of the time I'm in a double jointed snaffle and when I'm showing or prepping for a Western show I'm in a low port short shank curb. I am a firm believer that putting in the time for training is way better than relying on a bit to improve performance.